More on making copper wind vane

Copper work hardens, but how fast. If my friend was hammering copper to
"sculpt" it, how much depth/stretch could he do before it would have
to be annealed? To avoid cracking. I'd guess that it depends upon the
thickness of the copper, so is there a multiple of the thickness that he
could use as a rule of thumb?
Thanks,
Bob
Reply to
Bob Engelhardt
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